What term is used to describe a relationship where two or more organisms need to share resources that are essential for life, such as food, water, mates or territory

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?